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參數(shù)資料
| 型號(hào)： | R1232D251A-TR-F |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 1250 kHz SWITCHING FREQ-MAX, DSO8 |
| 封裝： | 0.90 MM HEIGHT, LEAD FREE, SON-8 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 847K |
| 代理商： | R1232D251A-TR-F |
R1232D
11
In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc
tonc
=t×VOUT/VIN............................................................................................................. Equation 2
When the ton
=tonc, the mode is the continuous mode.
OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
When P-channel Tr. of LX is ON:
(Wherein, Ripple Current P-P value is described as IRP, ON resistance of P-channel Tr. and N-channel Tr. of LX
are respectively described as RONP and RONN, and the DC resistor of the inductor is described as RL.)
VIN
=VOUT+(RONP+RL)×IOUT+L×IRP/ton .............................................................................. Equation 3
When P-channel Tr. of LX is "OFF"(N-channel Tr. is "ON"):
L
×IRP/toff=VF+VOUT+RONN×IOUT ....................................................................................... Equation 4
Put Equation 4 to Equation 3 and solve for ON duty of P-channel transistor, Don
=ton/(toff+ton),
DON
=(VOUTRONN×IOUT+RL×IOUT)/(VIN+RONN×IOUTRONP×IOUT) ........................................... Equation 5
Ripple Current is as follows;
IRP
=(VINVOUTRONP×IOUTRL×IOUT)×DON/fosc/L .............................................................. Equation 6
wherein, peak current that flows through L, and LX Tr. is as follows;
ILmax
=IOUT+IRP/2 .......................................................................................................... Equation 7
Consider ILmax, condition of input and output and select external components.
The above explanation is directed to the calculation in an ideal case in continuous mode.
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